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#1 2012-06-15 00:18:24

damo
#! gimpbanger
From: N51.5 W002.8 (mostly)
Registered: 2011-11-24
Posts: 2,189

HOWTO do Flame renders with GIMP

First off - I'm not a gimp-guru, I'm just a gimp-hobbyist! Secondly - the GIMP documentation has coverage of all the settings,  docs.gimp.org/en/plug-in-flame, and google will give you plenty of tuts and videos. So I'll do a quick run-through, and mention a couple of things I've found for myself.

"With the Flame filter, you can create stunning, randomly generated fractal patterns. You can't control the fractals as you can with the IFS Fractal filter, but you can steer the random generator in a certain direction, and choose from variations of a theme you like. "

To reproduce this....
aawvbo2H.jpg

...you will need - GIMP (I'm using 2.8 now) and the hardware to run it on (older machines can take a long time to render larger images). I tend to work with images 2 -3 times the finished size, and at a higher resolution than the finished image, so that as much detail is preserved as possible during editing. Then I scale it down to the final size before exporting to png/jpg (The gimp docs are probably well-out-of-date now since it says that this filter is unmaintained, and doesn't work with large images, but I've used it up to 3600px without probs)

Run the plug-in with Filters > Render > Nature > Flame
The flame filter needs something to work with, and for this one I made a difference clouds layer from a plain white bg (Filters > Render > Clouds > Difference clouds, with defaults) cos it makes the effect quite subtle imo. There are choices of default colormaps as well.
aajXGMGq.jpg


From the initial pattern, choose Edit, to give 8 variations which you can use to initialise a different render. (Be prepared to spend a long time exploring and playing around with these - I find it fascinating smile )
aalvYQmM.jpg

After finding the pattern you want, and tweaking its position with the Camera options, it can be saved to file so you can run it again in the future with the same settings.
(I keep my GIMP stuff like this in a gimp-resources directory - in this case "flame-renders") This is just a text file (no extension needed), so if you want to reproduce this one...

time 0.102632
image_size 1600 1200 center 0.5 0 pixels_per_unit 100
spatial_oversample 2 spatial_filter_radius 0.75 sample_density 1.1
nbatches 1 white_level 200
brightness 1 gamma 2 cmap_inter 0
xform 0 density 1 color 1
var 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
coefs 0.738916 -0.270673 0.282765 -0.708743 0.487048 0.844329
xform 1 density 1 color 0
var 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
coefs -0.672005 0.509708 -0.0624324 -0.672905 0.370911 0.702516
xform 2 density 1 color 0
var 0 0 0 0.897368 0 0 0 0.102632 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
coefs -0.580382 -0.778226 -0.869602 0.0447842 -0.158287 -0.531281

and call it what you like.

It's best to play with the brightness etc after the render, because you can see the effects immediately. On my Dell Inspiron, this 1600x1200 image took 7.5s with Gimp-2.8 on Waldorf, but 12.5s with Gimp-2.6 on Statler. 3200x2400 took 78s with Waldorf/Gimp-2.8.
aaj7xQxX.jpg


The background gradient was from a Metallic gradient I got from deviantArt in the dim past (icytina's maybe?). Again, gradients are saved in text files, with a .ggr extension, so if you want to reproduce this one...

GIMP Gradient
Name: *Silver
7
0.000000 0.071429 0.142857 0.275000 0.275000 0.275000 1.000000 0.531000 0.531000 0.531000 1.000000 0 0 0 0
0.142857 0.214286 0.285714 0.531000 0.531000 0.531000 1.000000 0.800000 0.800000 0.800000 1.000000 0 0 0 0
0.285714 0.357143 0.428571 0.800000 0.800000 0.800000 1.000000 0.928000 0.928000 0.928000 1.000000 0 0 0 0
0.428571 0.500000 0.571429 0.928000 0.928000 0.928000 1.000000 0.928000 0.928000 0.928000 1.000000 0 0 0 0
0.571429 0.642857 0.714286 0.928000 0.928000 0.928000 1.000000 0.800000 0.800000 0.800000 1.000000 0 0 0 0
0.714286 0.785714 0.857143 0.800000 0.800000 0.800000 1.000000 0.531000 0.531000 0.531000 1.000000 0 0 0 0
0.857143 0.928571 1.000000 0.531000 0.531000 0.531000 1.000000 0.275000 0.275000 0.275000 1.000000 0 0 0 0

and save as eg silver.ggr in your .gimp-2.x/gradients directory

EDIT Particularly good howto: fractal-art-with-flames-and-lights-using-gimp

Happy rendering smile ......

Last edited by damo (2012-06-24 22:21:53)


Artwork at deviantArt;  Iceweasel Personas;  SLiM #! Themes;  Openbox themes

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#2 2012-06-15 01:50:33

machinebacon
#! unstable
Registered: 2009-07-02
Posts: 6,586

Re: HOWTO do Flame renders with GIMP

Many, many thanks, damo. Bookmarked for next weekend big_smile

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#3 2012-06-15 02:12:22

VastOne
#! Ranger
From: #! Fringe Division
Registered: 2011-04-26
Posts: 10,163
Website

Re: HOWTO do Flame renders with GIMP

Well done damo, I always look for tips and tricks for the Gimpster.

Thank you!

I have added this to Quick References.


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#4 2012-06-15 02:16:43

damo
#! gimpbanger
From: N51.5 W002.8 (mostly)
Registered: 2011-11-24
Posts: 2,189

Re: HOWTO do Flame renders with GIMP

VastOne wrote:

Well done damo, I always look for tips and tricks for the Gimpster.

Thank you!

I have added this to Quick References.

Nice one smile


Artwork at deviantArt;  Iceweasel Personas;  SLiM #! Themes;  Openbox themes

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#5 2012-06-24 22:22:52

damo
#! gimpbanger
From: N51.5 W002.8 (mostly)
Registered: 2011-11-24
Posts: 2,189

Re: HOWTO do Flame renders with GIMP

Added a good step-by-step howto: fractal-art-with-flames-and-lights-using-gimp


Artwork at deviantArt;  Iceweasel Personas;  SLiM #! Themes;  Openbox themes

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